endoplasm

American  

[en-duh-plaz-uhm] / ˈɛn dəˌplæz əm /

noun

Cell Biology.

1. the inner portion of the cytoplasm of a cell.

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endoplasm British  

/ ˈɛndəʊˌplæzəm /

noun

1. cytology the inner cytoplasm in some cells, esp protozoa, which is more granular and fluid than the outer cytoplasm See ectoplasm

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Other Word Forms

Derived Forms

• endoplasmic
  adjective

Etymology

Origin of endoplasm

First recorded in 1880–85; endo- + -plasm

Explanation

The dense, interior layer of a cell's cytoplasm is its endoplasm. Most cellular processes take place in the endoplasm. Endoplasm comes from Greek roots endon, "within or inside," and plasm, "shape." It's the innermost part of a cell, aside from the nucleus. Endoplasm is often granular, in contrast to the watery ectoplasm which lies between it and the cell wall. If your biology teacher mentions endoplasm, she’s probably talking about those tiny, single-celled organisms called amoebas.

Example Sentences

The endoplasm usually, but not always, contains a bright red eye-spot.

From Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 by Calkins, Gary N. (Gary Nathan)

The sarcocyte alone constitutes the septum, traversing the endoplasm, in septate Gregarines.

From Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 5 "Greek Law" to "Ground-Squirrel" by Various

Differentiation of ectoplasm and endoplasm distinct or wanting.

From Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 by Calkins, Gary N. (Gary Nathan)

In some cases ectoplasm and endoplasm can be distinguished.

From Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 by Calkins, Gary N. (Gary Nathan)

The endoplasm appears well filled with food bodies, some of which could be distinguished as Amphidinium and Glenodinium.

From Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 by Calkins, Gary N. (Gary Nathan)